The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 26 |
| 3 | 15 |
| 4 | 20 |
| 5 | 39 |
| 6 | 83 |
| 7 | 135 |
| 8 | 356 |
| 9 | 967 |
| 10 | 1769 |
| 11 | 4507 |
| 12 | 12371 |
| 13 | 26399 |
| 14 | 63179 |
| 15 | 165527 |
| 16 | 395372 |
| 17 | 931693 |
| 18 | 2375263 |
| 19 | 6054813 |
| 20 | 14584383 |
| 21 | 36884172 |
| 22 | 96563393 |
| 23 | 240916042 |
| 24 | 612770703 |
| 25 | 1617727061 |
| 26 | 4165995075 |
| 27 | 10744297142 |
| 28 | 28487711557 |
| 29 | 75039015902 |
| 30 | 196719916483 |
[1,26,15,20,39,83,135,356,967,1769,4507,12371, 26399,63179,165527,395372,931693,2375263,6054813, 14584383,36884172,96563393,240916042,612770703, 1617727061,4165995075,10744297142,28487711557, 75039015902,196719916483] |